The fashion world starting working last summer to get this trend to take hold, but it never really seemed to catch fire. Could now be its time? It looks like it just might be. If it pops up again in the next couple of weeks, it'll be official—after all, the rule is that three makes a trend. If that happens, I'll keep you updated. For now, check out how Petra made one look super cute a few months ago and see if you don't get inspired to follow her lead.